March 28:
A.D. 193: Roman Emperor Pertinax is assassinated by Praetorian Guards and his throne is auctioned off to Didius Julianus.
A.D. 364: Emperor Valentinian I appoints his brother Flavius Valens co-emperor.
A.D. 845: Paris is sacked by Viking raiders who collect a huge ransom in exchange for leaving.
A.D. 1794: Le Louvre opens to the public.